package Reflection;


import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

//分析性能问题
public class Test10 {
    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        test01();
        test02();
        test03();
    }
    //普通方式调用
    public static void test01(){
        User user = new User();
        long startTime = System.currentTimeMillis();
        for (int i = 0; i < 1000000000; i++) {
            user.getName();
        }
        long endTime = System.currentTimeMillis();
        System.out.println(endTime-startTime+"ms");

    }

        //反射方式调用
    public static void test02() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName", null);
        long startTime = System.currentTimeMillis();
        for (int i = 0; i < 1000000000; i++) {
            getName.invoke(user,null);
        }
        long endTime = System.currentTimeMillis();
        System.out.println(endTime-startTime+"ms");

    }


        //反射方式调用，关闭检测
        public static void test03() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
            User user = new User();
            Class c1 = user.getClass();
            Method getName = c1.getDeclaredMethod("getName", null);
            getName.setAccessible(true);
            long startTime = System.currentTimeMillis();
            for (int i = 0; i < 1000000000; i++) {
                getName.invoke(user,null);
            }
            long endTime = System.currentTimeMillis();
            System.out.println(endTime-startTime+"ms");

        }





}
